Piston ring

Abstract

The utility model provides a piston ring and relates to the technical field of piston rings. The piston ring comprises the opening and the position opposite to the opening, the highest point is arranged on the operation face of the piston ring, and the height of the highest point at the position of the opening is larger than that of the highest point close to the position opposite to the position of the opening. The pressure value of the bottom surface contact pressure near the opening position is lower than the pressure value near the position opposite to the opening, so that on one hand, the abrasion of the bottom surface near the opening position can be solved, and on the other hand, the value of the highest point of the running surface near the position opposite to the opening is relatively low; and therefore, the engine oil consumption near the position opposite to the opening cannot be influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to piston ring technical field, especially a piston ring. BACKGROUND

[0002] High explosion pressure and high power will be one of the main features of next generation engine technology upgrade, and high explosion pressure and power put forward more stringent requirements on engine performance. Engine piston ring as one of the core components of the engine will face higher blow-by gas amount and oil consumption performance demand challenges.

[0003] High explosion pressure will lead to a ring bottom surface wear problem, analysis shows that the contact pressure of the bottom surface has a greater impact on the wear of the bottom surface, and the barrel surface high point of the running surface has a great impact on the contact pressure of the bottom surface, which is almost linear. The greater the barrel surface high point of the running surface, the lower the bottom surface contact pressure, and the lower the barrel surface high point of the running surface, the greater the bottom surface contact pressure.

[0004] The existing typical top ring running surface barrel surface high point design, specifically, the barrel surface high point of the running surface remains unchanged, a fixed value, on the ring. The disadvantage of this design is that the barrel surface high point of the running surface affects the contact pressure of the bottom surface. Since the barrel surface high point is fixed, the bottom surface contact pressure is fixed on the ring. High barrel surface high point design is good for bottom surface wear, but bad for oil consumption. Low barrel surface high point is harmful to bottom surface wear, but beneficial to oil consumption. The fixed barrel surface high point design of the running surface is difficult to balance the bottom surface wear and oil consumption problems. In addition, the existing technology designs the barrel surface high point as a periodic change, and such design mainly solves the lubrication problem of the running surface, ensures the oil consumption and blow-by gas amount, and cannot solve the bottom surface wear problem. SUMMARY

[0005] One object of the first aspect of the utility model is to provide a piston ring to solve the problem that the barrel surface high point design in the prior art cannot solve the wear of the lower side of the barrel surface.

[0006] In particular, the utility model provides a piston ring, which has an opening and a position opposite to the opening; the piston ring also has a running surface; the running surface is a curved surface or a conical surface with the highest point in the radial direction of the ring; the height of the highest point of the running surface near the opening position in the axial direction of the piston ring is higher than the height of the highest point near the position opposite to the opening in the axial direction of the piston ring.

[0007] Optionally, the piston ring comprises a first area located on both sides of the opening position and a second area located on both sides of the position opposite to the opening;

[0008] The height of the highest point of the running surface of the first region in the axial direction of the piston ring is higher than the height of the highest point of the running surface of the second region in the axial direction of the piston ring.

[0009] Optionally, the angle of the circular arc where the first region is located is 15-30°.

[0010] Optionally, the height of the highest point of the running surface of the second region at different circumferential positions is the same.

[0011] Optionally, the running surface in the second region is a curved surface, and the running surface in the second region satisfies H1<0.5H, d2>d1, and d1<30um; wherein H is the ring height of the piston ring, H1 is the straight-line distance from the highest point of the running surface of the second region to the bottom surface of the piston ring, d1 is the radial size at a position halfway between the highest point and the bottom surface, and d2 is the radial size at a position where the distance from the bottom surface to the running surface is 3 times H1.

[0012] Optionally, the running surface in the second region is a conical surface, the radial size of the conical surface gradually increases from the top surface to the bottom surface, and the angle between the conical surface and the vertical direction ranges from 30′ to 10°.

[0013] Optionally, the running surface of the second region has a grinding belt below the conical surface; the radial size of the grinding belt is the same, and the height L of the grinding belt is greater than 0.1mm and less than or equal to half of the ring height of the piston ring.

[0014] Optionally, the height of the highest point of the running surface at the first region gradually increases in the direction gradually approaching the opening position.

[0015] Optionally, the first region further includes a first sub-region and a second sub-region, the second sub-region is located between the first sub-region and the second region; the height of the highest point of the running surface in the first sub-region is the same, and the height of the highest point of the running surface in the second sub-region gradually increases in the direction from the second region to the first sub-region.

[0016] Optionally, the running surface in the first region is a curved surface, and a highest point of the running surface at the opening position satisfies: 0.5H >= H2 > 0.2H, H2 > H1 + 0.2, d4 > d3, 100um > d3 > 5um; wherein H2 is a straight line distance from the highest point of the first region to a top surface of the piston ring, H1 is a straight line distance from the highest point of the running surface of the second region to a bottom surface of the piston ring; H is a ring height of the piston ring; d3 is a radial dimension of a position at half distance between the highest point and the top surface from the highest point; and d4 is a radial dimension of a position at a distance of 3 times H2 from the highest point.

[0017] The height of the highest point at the opening position of the piston ring is higher than the height of the highest point near the position opposite to the opening position, so that the bottom surface contact pressure near the opening position is lower than the pressure near the position opposite to the opening position, which can solve the wear of the bottom surface near the opening position, and the height of the highest point of the outermost surface near the position opposite to the opening position is low, so that the oil consumption near the position opposite to the opening position is not affected.

[0018] The highest point of the running surface of the piston ring is formed as the first region a and the second region b, so that the wear of the bottom surface of the piston ring is solved, and the processing difficulty is reduced.

[0019] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of some embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Some specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the drawings:

[0021] Figure 1 is a schematic structural diagram of a piston ring according to one specific embodiment of the present application;

[0022] Figure 2 is a sectional view after cutting along A-A in Figure 1 ;

[0023] Figure 3 is a sectional view of one embodiment after cutting along B-B in Figure 1 ;

[0024] Figure 4 is a sectional view of one embodiment after cutting along B-B in Figure 1FIG. 3 is a cross-sectional view of another embodiment of the piston ring of FIG. 1 taken along the line B-B;

[0025] Figure 5 FIG. 6 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to one specific embodiment of the present application when the running surface is a curved surface;

[0026] Figure 6 FIG. 7 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to one specific embodiment of the present application when the running surface is a conical surface;

[0027] Figure 7 FIG. 8 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to another specific embodiment of the present application when the running surface is a curved surface;

[0028] Figure 8 FIG. 9 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to another specific embodiment of the present application when the running surface is a conical surface;

[0029] Figure 9 FIG. 10 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to yet another specific embodiment of the present application when the running surface is a curved surface;

[0030] Figure 10 FIG. 11 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to yet another specific embodiment of the present application when the running surface is a conical surface;

[0031] Figure 11 FIG. 12 is a diagram showing the structure of the piston ring according to one specific embodiment of the present application;

[0032] Figure 12 FIG. 13 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to yet another specific embodiment of the present application when the running surface is a curved surface;

[0033] Figure 13 FIG. 14 is a diagram showing the distribution of the highest points of the running surface of the piston ring according to yet another specific embodiment of the present application when the running surface is a conical surface.

[0034] BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Piston ring - 100; opening - 110; running surface - 120; highest point - 121; bottom surface - 130; top surface - 140. DETAILED DESCRIPTION

[0036] In the description of the present embodiment, it needs to be understood that the terms "length", "width", "height", "upper", "lower", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model.

[0037] As a specific embodiment of the present utility model, as shown in the drawings, Figures 1-3 The piston ring 100 has an opening 110 and a position opposite to the opening 110. The piston ring 100 also has a running surface 120. The running surface 120 is a curved surface or a conical surface having a highest point 121 in the radial direction. The height of the highest point 121 of the running surface 120 at the position close to the opening 110 in the axial direction of the piston ring is higher than the height of the highest point 121 at the position opposite to the opening 110.

[0038] Specifically, since the contact pressure of the highest point 121 of the running surface 120 on the bottom surface is greatly affected, it is almost linear. The greater the highest point 121 of the running surface 120, the lower the contact surface pressure of the bottom surface 130, and the lower the highest point 121 of the running surface 120, the greater the contact surface pressure of the bottom surface 130. In actual use of the piston ring 100, after the piston ring 100 endures the explosion pressure, the degree of wear of the bottom surface 130 of the piston ring 100 is more serious at the position close to the opening 110, and relatively lighter at the position opposite to the opening 110. Therefore, by setting the height of the highest point 121 at the opening 110 to be higher than the height of the highest point 121 at the position opposite to the opening 110, the present embodiment can make the contact pressure of the bottom surface 130 at the position close to the opening 110 lower than the contact pressure at the position opposite to the opening 110, which can solve the wear of the bottom surface 130 at the position close to the opening 110, and since the value of the highest point 121 of the running surface 120 at the position opposite to the opening 110 is relatively low, it will not affect the oil consumption at the position opposite to the opening 110.

[0039] Specifically, the height in the present embodiment refers to the height in the axial direction of the piston ring.

[0040] As a specific embodiment of the present utility model, as shown in the drawings, Figure 1As shown, the piston ring 100 of the embodiment can include a first area a located at both sides of the position of the opening 110 and a second area b located at both sides of the opposite position of the opening 110. The height of the highest point 121 of the running surface 120 of the first area a is higher than the height of the highest point 121 of the running surface 120 of the second area b.

[0041] Specifically, the embodiment forms the structure of the highest point 121 of the running surface 120 of the piston ring 100 into the first area a and the second area b, which can solve the problem of the wear of the bottom surface 130 of the piston ring 100 and reduce the difficulty of processing.

[0042] More specifically, the angle of the circular arc of the first area a of the embodiment is 15°-30°. For example, the angle can be 15°, 20°, 25° or 30°. The selection of the angle is mainly related to the stress condition of the piston ring 100. Generally, the wear of the bottom surface 130 of the piston ring 100 is greater in the angle range, so the height of the highest point 121 of the outer surface in the angle range is higher, thereby reducing the wear.

[0043] As a specific embodiment of the utility model, as shown in Figure 3 As shown, the height of the highest point 121 of the running surface 120 of the second area b of the embodiment is the same at different positions in the circumferential direction.

[0044] Specifically, since the second area b is relatively far away from the position of the opening 110, and the wear amount at different positions of the second area b is not much different and is small, the design of the highest point 121 of the running surface 120 at different positions of the second area b can not affect the oil consumption, and the design of the height of the highest point 121 of the running surface 120 of the second area b to be the same can reduce the difficulty of processing.

[0045] As a specific embodiment of the utility model, as shown in Figure 3 As shown, the running surface 120 in the second area b of the embodiment is a curved surface, and the running surface 120 in the second area b satisfies H1<0.5H, d2>d1, d1<30um. Wherein, H is the ring height of the piston ring 100. H1 is the vertical distance from the highest point 121 of the running surface 120 of the second area b to the bottom surface 130 of the piston ring 100, d1 is the radial size of the position between the highest point 121 and the bottom surface 130. d2 is the radial size of the position where the distance from the running surface 120 to the bottom surface 130 is 3 times H1 from the highest point 121.

[0046] Specifically, the height of the highest point 121 of the running surface 120 of the second area b of the embodiment is low, and specifically the height of the highest point 121 is lower than half of the ring height, which can reduce the oil consumption.

[0047] Specifically, the highest point 121 of the running surface 120 can reach the bottom surface 130 of the running surface 120, and of course preferably has a certain distance from the bottom surface 130, so as to facilitate processing and reduce wear.

[0048] In addition, h1 in the figure of the embodiment is the height of the position of half between the highest point 121 and the bottom surface 130, and the corresponding radial distance of the highest point 121 is d1, and the height of the position of the distance of the running surface 120 from the bottom surface 130 being 3 times H1 is h2.

[0049] As one specific embodiment of the utility model, H1 of the embodiment mainly considers the wear of the running surface 120 of the piston ring 100, and since the wear at the second region b is small, but the oil consumption is high. Therefore, H1 at the second region b does not need to be too high, and the embodiment designs H1 <0.5H, which can reduce the oil consumption.

[0050] In addition, in the embodiment, d2>d1, and d1<30um, so the design can further reduce the oil consumption.

[0051] As one specific embodiment of the utility model, as shown in the figure, Figure 4 The running surface 120 in the second region b of the embodiment is a conical surface, the radial dimension of the conical surface gradually increases in the direction from the top surface 140 to the bottom surface 130, and the included angle α of the conical surface with the vertical direction is in the range of 30′-10°. Specifically, the included angle α of the conical surface with the vertical direction in the embodiment can be 30′, 1°, 3°, 5°, 7°, 9° or 10°.

[0052] As one specific embodiment of the utility model, as shown in the figure, Figure 4 The conical surface of the running surface 120 in the second region b of the embodiment has a grinding belt below. The radial dimensions of the grinding belts are the same, and the height L of the grinding belt is greater than 0.1mm, and L is less than or equal to half of the ring height of the piston ring 100.

[0053] Specifically, the grinding belt below the conical surface of the embodiment can improve the anti-wear ability on the one hand, and reduce the process difficulty on the other hand.

[0054] As one specific embodiment of the utility model, as shown in the figure, Figure 2As shown, the running surface 120 in the first region a of the embodiment is a curved surface, and the highest point 121 of the running surface 120 at the position of the opening 110 satisfies 0.5H≥H2>0.2H, d4>d3, 100μm>d3>5um. Wherein, H2 is the straight-line distance from the highest point 121 of the first region a to the top surface 140 of the piston ring 100, and H is the ring height of the piston ring 100. d3 is the radial dimension of the position at half between the highest point 121 and the top surface 140 from the highest point 121. d4 is the radial dimension of the position at the distance of 3 times H2 of the running surface 120 from the top surface 140.

[0055] Specifically, in the embodiment, the height of the position at half between the highest point 121 and the top surface 140 is h3, and the vertical distance of the position at the distance of 3 times H2 of the running surface 120 from the top surface 140 is h4. In the embodiment, h3 and h4 define the barrel surface shape, and the control of h3 and h4 can control the curvature of the running surface 120. Defining the two values of h3 and h4 has an effect on the lubrication of the running surface 120.

[0056] Specifically, in the embodiment, H2 mainly considers wear, and the higher H2 is, the better it is for wear, but it is not good for oil consumption, and the control of the point positions h3 and h4 can control the curvature of the running surface 120. The greater the curvature, the more rounded it is, which is good for lubrication.

[0057] Specifically, in the embodiment, 100μm>d3>5um, which makes d3 not too small, and the piston ring 100 does not scrape oil upward. If d3 is too small, the piston ring 100 scrapes oil upward, which will cause oil consumption problems. In addition, d4>d3 makes the lubrication at the position of the opening 110 better, because the highest point 121 of the running surface 120 is relatively high at the opening 110, and if the lubrication is not enough, the wear will be more serious.

[0058] As a specific embodiment of the utility model, as shown in the drawings, Figures 5-10 As shown, the running surface 120 at the first region a of the embodiment gradually increases in height along the direction gradually approaching the position of the opening 110. Specifically, the highest point 121 of the running surface 120 at the first region a gradually increases along the direction approaching the position of the opening 110, which on the one hand satisfies the gradually increasing wear of the piston ring 100 at the position approaching the opening 110 and balances the wear, and on the other hand makes the highest point 121 of the running surface 120 at the first region a and the second region b gradually transition.

[0059] Specifically, the highest point 121 of the running surface 120 at the first region a of the embodiment can linearly increase or arcuately increase along the direction gradually approaching the position of the opening 110, and the arc can be formed as an upwardly curved arc (as shown in the drawings). Figure 5and Figure 6 an upwardly curved arc (as shown in Figure 7 and Figure 8 a downwardly curved arc (as shown in Figure 9 and Figure 10 a serpentine shape (as shown in and

[0060] The location of the highest point 121 of the first region a of the embodiment is either one of the above forms, and the height of the highest point 121 near the opening 110 is the highest. Preferably, the highest point 121 of the running surface 120 of the first region a of the embodiment is an upwardly curved arc or a downwardly curved arc in the circumferential direction, and this design is achieved by machining. Figure 11 As another specific embodiment of the present application, as shown in

[0061] The first region a of the embodiment can further include a first sub-region a1 and a second sub-region a2, and the second sub-region a2 is located between the first sub-region a1 and the second region b. The height of the highest point 121 of the running surface 120 in the first sub-region a1 is the same, and the height of the highest point 121 of the running surface 120 in the second sub-region a2 gradually increases from the second region b to the first sub-region a1.

[0062] Specifically, the highest point 121 of the running surface 120 of the second sub-region a2 of the embodiment gradually rises and reaches the maximum height when reaching the first sub-region a1. The height of the highest point 121 of the running surface 120 at the second sub-region a2 gradually changes, which can not only transition, but also balance the wear gradually approaching the position of the opening 110, so that the wear of the piston ring 100 near the opening 110 is uniform and small. Figure 12 Figure 13 Specifically, the highest point 121 of the running surface 120 of the second sub-region a2 of the embodiment can linearly increase (as shown in

[0063] At this point, those skilled in the art should recognize that although the present application has been fully shown and described in the above embodiments, many other variants or modifications in accordance with the principles of the present application can be directly determined or deduced based on the disclosure of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variants or modifications.

Claims

1. A piston ring having an open position and an open-opposite position, the piston ring further having a running surface, the running surface being a curved or conical surface having a highest point in the radial direction of the ring, characterized in that, The highest point of the running surface near the opening is at a higher axial height on the piston ring than the highest point at the opposite position near the opening.

2. The piston ring according to claim 1, characterized in that, The piston ring includes a first region located on both sides of the opening position and a second region located on both sides of the opposite position of the opening; The highest point of the operating surface in the first region is at a higher axial position on the piston ring than the highest point of the operating surface in the second region.

3. The piston ring according to claim 2, characterized in that, The angle of the arc containing the first region is 15-30°.

4. The piston ring according to claim 2, characterized in that, The highest point of the running surface in the second region is at the same height at different positions in the circumferential direction.

5. The piston ring according to claim 2 or 4, characterized in that, The operating surface in the second region is a curved surface, and the operating surface in the second region satisfies: H1 < 0.5H, d2 > d1, d1 < 30 μm; where H is the ring height of the piston ring; H1 is the straight-line distance from the highest point of the operating surface in the second region to the bottom surface of the piston ring; d1 is the radial dimension from the highest point at a position halfway between the highest point and the bottom surface; d2 is the radial dimension from the highest point at a position where the distance from the operating surface to the bottom surface is 3 times H1.

6. The piston ring according to claim 2 or 4, characterized in that, The operating surface in the second region is a conical surface, and the radial dimension of the conical surface gradually increases from the top surface to the bottom surface. The angle between the conical surface and the vertical direction is in the range of 30′~10°.

7. The piston ring according to claim 6, characterized in that, The second region has a grinding belt below the conical surface of the operating surface; the grinding belt has the same radial dimension, and the height L of the grinding belt is greater than 0.1 mm, and L is less than or equal to half the ring height of the piston ring.

8. The piston ring according to claim 2, characterized in that, The height of the highest point of the running surface in the first region gradually increases along the direction that gradually approaches the opening.

9. The piston ring according to claim 2, characterized in that, The first region further includes a first sub-region and a second sub-region, with the second sub-region located between the first sub-region and the second region; the highest point of the running surface in the first sub-region is at the same height, and the highest point of the running surface in the second sub-region gradually increases in height from the second region to the first sub-region.

10. The piston ring according to claim 8 or 9, characterized in that, The operating surface in the first region is a curved surface, and the highest point of the operating surface at the opening position satisfies: 0.5H≥H2>0.2H, H2>H1+0.2, d4>d3, 100μm>d3>5μm; where H2 is the straight-line distance from the highest point of the first region to the top surface of the piston ring, H1 is the straight-line distance from the highest point of the operating surface of the second region to the bottom surface of the piston ring; H is the ring height of the piston ring; d3 is the radial dimension from the highest point at a position halfway between the highest point and the top surface; d4 is the radial dimension from the highest point at a position where the distance from the operating surface to the top surface is 3 times H2.

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